Sheet-metal construction.



M.- ANDERSON. SHEET METAL CONSTRUCTION. AIPLIGATIONHLED APR. 7, 1911.

1,062,210,, Patented may 20, 1913. l 2 SEEETSSHEET 1.

M. ANDERSON.

SHEET METAL oousmnomom.

APPLIOATIQN FILED APR. 7, 1911..

Patented May 20, 1913 MORRIS Annnnson, or JAMESTOWN, new YoaK.

SHEET-METAL CONSTRUCTION.

Specification of Letters Patent.

Application filed April 7, 1911. Serial No. 619,506.

T 0 e21 whom it may concern Be it known that 1, MORRIS ANDERSON,-

The invention relates to improvements in sheet metal construction,particularly to sheet metal seams; and the object of my improvement isto .provide an interlocking seam which it is practically impossible toopen under extreme heat, and the invention consists in the constructionand arrangement of the parts and its adaptation to the differentparts ofa sheet metal door or window, as described in this specification andshown in the accompanying drawings and pointed out in the claim.

Thehollow sheet metal construction has proved .inadaquate in itsfireproof qualities on account of the seams separating or open ing underintense heat or by accident. My improved sheet metal construction asherein described provides a simple, durable construction in which theseams are so locked that they cannot separate, and the door is so puttogether that it forms a perfect sheet metal fireproof closure for acompartment and it is apparent that this locked seam is applicable toall forms of sheet metal fireproof fittings, including sheet metaldoors, windows and the casings for the same.

In the drawings Figure l is an elevation of a sheet metal door. Fig. 2is a sectional view at line X X in Fig.1, showing the locked seamat eachside and the manner of mounting a plate of glass either in the upperpart of the door or in a sheet metal window. Fig. 3 is a sectional viewat line Y Y in- Fig. 1, showing the construction for holding a sheetmetal panel with the improved seam at each side of the stile; and

Fig. dis a similar view showing a modification of the construction shownin Fig. 3 with the locking seam each side of the anel, the locking endsof the seam servmg as a holding means for the sheet metal panel; in mostcases this latter form is preferred; and Fig. 5 is a. still furthermodification of the construction at line Y Y showing the adaptation ofthe seam construction to a continuous panel and molding. Fig. 6 is .adetail sectional 'view of view of the completed seam after the theseparated edges of the-sheet metal as formed to slide together into theimproved Patented May 20, 1913..

seam for theabutting edges as shown at line Z Z in Fig. l; and Fig. 7 isa. sectional arts are slipped to ether. Fig. 8 is a sectional View of adoub le or two-way seam for abutting edges, showing the double look uponthe same; and Fig. .9 is a sectional view of a single-way seam having 'adouble lock; these modifications shown in Figs. 8 and 9 may be used inplace of the seam shown in Figs. 6 and 7, to give added security inheavy doors. F ig. 10 is a sectional View at line Y Y showing the use ofthe seamsthe same as in'Fig. 3, in connecting the molding to the stilesand also showing the.

turned edge locking principle applied to the edges of. the panel sheets,a box being formed in the groove between the moldings to receive saidlocking edgef Fig. 11 is a sectional view at line Z Z for a doublewayseam for heavy doors to hold the stiles and rails a spaced distanceapart; and Fig. 12 is a sectional view at line Z Z of a multiplicationof this double seam construction for heavy doors to hold the stiles andrails a fixed distance apart so that they cannot be separated.

Like numerals of reference refer to corresponding parts in the severalviews.

The numeral 10 indicates the hollow sheet metal stile, thenumeral 11 themolding and looped part 13 and the edge 1 1 of the return bend whichenters into the looped portion and forms a seam 15, as shown in Fig. 6',so'that the two may he slipped together,

as shown in Fig. 7 and it is obviousthat when so slipped togetherandplaced under heavy pressure the entire seam Wlll be locked in place sothat neither accident nor intense heat can force the two edges apart.

For added security in certain kinds, of sheet' metal, a double ortwo-way seam as shown at 16 in Fig. 8 having the two turned or lockingends is used, or this turned edge of the seam may-be applied to asingle-way scam in the double locking form, as shown at 17 in Fig. 9. Itis apparent that either of these two-way seams shown" in Figs. 8 and 9can be pressed into place by means of a'suitable die and press. Thislocking principle of the turned seam is shown in the also in holding thepanel 12 by extending ing stripis formed on one side in its central,

the edges of the sheet metal panel around the outwardly turned ends 18as shown in Fig. 4:, thereby making the locked seam each side of theedge of the sheet metal panel 12 'in such a manner as to absolutelyprevent the separation of the sheet metal panel from the hollow stile10. This form of construction is preferably used in light doors. Forheavy doors the modifications shown in Fig. may beused which appliesstill further this locking principle at 19. The groove 21 as showninFig. 3 is formed with a box at its inner end and the edges 22 of thesheet metal panels 12 are turned in a locking clo sure within said box,said edges 22 stop at each side of the box. 1

1n order to hold and brace the sides of the door a spaced distanceapart, particularly in heavy doors, the two-way seam shown in Fig. 8 ispreferred, and the lockportion by an extension 2 having adovetail-shaped end 25. The strip 26 on the opposite side is formed withoppositel placed flanges 27 which form a dove-tai -shaped openingtherebetween, into which the dovetail-shaped edge of extension 2 isslipped, thereby holding the two parts firmly in-positionand bracing thesides of the door so they cannot be separated'or changed in theirrelation to one another.

It also braces these two sides of the door at the point of the abuttingseam between the two parts, as for example, between the stiles and crossrails,-which will be recognized as the weakest portion of the hollowdoor construction. The locked seam is also used for the connection ofthe molding to the stiles in holding the glass panels 28 in whichconstruction the moldin is formed for one side only and a loose mo di 29is attached by a suitable screw 30 within the angle on the opposite sideof the glass 38, as shown in Fig. 2.

It is obvious that all of these parts may be easily formed with suitabledies and slipped together into the forms shown, and when so slippedtogether may be spot j wu al.deel or acetylene welded if so desired. Iclaim as new:

,In a sheet metal door, stiles and cross rails, oppositely placed seamson the opposite sides of the door to connect said parts having inwardlyand. oppositely turned edges, a binding strip fitting over saidoppositely turned edges to hold the same, the edges of said seams turnedin angular flanges to lock the same against withdrawal, said bindingstrips having grooves bent therein, and a strip of metal'fitting withinsaid grooves on the oppositely placed binding strips to hold said partsa spaced distance apart.

In testimpny whereof I have signed my name to this specification in-thepresence of two subscribing witnesses.

MORRIS ANDERSON.

Witnesses:

ARTHUR OuMonsm, CHARLES H. WIBORG.

